dear friend,
my program is running & not retrieving password from flash, please help
i am using due
deuflash.ino (1.67 KB)
if i use
configuration.pass = "chnewpass";
instead of
chnewpass[0]='1';
chnewpass[1]='2';
chnewpass[2]='3';
chnewpass[3]='4';
configuration.pass = (chnewpass);
it is working but i need to pass it through a variable as it is received from keypad.
thanks in advance
You didn't use DueFlashStorageStructureExample.ino properly.
In this modified version, the password is retrieved:
#include <DueFlashStorage.h>
DueFlashStorage dueFlashStorage;
char chnewpass[5];
struct Configuration {
char* pass;
};
Configuration configuration;
void setup() {
Serial.begin(115200);
chnewpass[0] = '1';
chnewpass[1] = '2';
chnewpass[2] = '3';
chnewpass[3] = '4';
chnewpass[4] = '5';
configuration.pass = (chnewpass);
/* Flash is erased every time new code is uploaded. Write the default configuration to flash if first time */
// running for the first time?
uint8_t codeRunningForTheFirstTime = dueFlashStorage.read(0); // flash bytes will be 255 at first run
Serial.print("codeRunningForTheFirstTime: ");
if (codeRunningForTheFirstTime) {
Serial.println("yes");
/* OK first time running, set defaults */
// write configuration struct to flash at adress 4
byte b2[sizeof(Configuration)]; // create byte array to store the struct
memcpy(b2, &configuration, sizeof(Configuration)); // copy the struct to the byte array
dueFlashStorage.write(4, b2, sizeof(Configuration)); // write byte array to flash
// write 0 to address 0 to indicate that it is not the first time running anymore
dueFlashStorage.write(0, 0);
}
else {
Serial.println("no");
}
}
void loop() {
byte* b = dueFlashStorage.readAddress(4); // byte array which is read from flash at adress 4
Configuration configurationFromFlash; // create a temporary struct
memcpy(&configurationFromFlash, b, sizeof(Configuration)); // copy byte array to temporary struct
Serial.print(" pass: ");
for (int i = 0; i < 5; i++) {
Serial.print(configurationFromFlash.pass[i]);
}
Serial.println();
delay(1000);
}
dear friend,
the below code should be run only once so i placed it inside "if (codeRunningForTheFirstTime)" loop
then this not working
chnewpass[0] = '1';
chnewpass[1] = '2';
chnewpass[2] = '3';
chnewpass[3] = '4';
chnewpass[4] = '5';
configuration.pass = (chnewpass);
why ?
i cross checked this "Serial.print(configurationFromFlash.pass*);"*
is just using "configuration.pass = (chnewpass);" and printing
if i use
configuration.pass = "chnewpass";
inside "if (codeRunningForTheFirstTime)" loop
it is working
but ............
if i place the below code inside "if (codeRunningForTheFirstTime)" loop
then this not working
chnewpass[0] = '1';
chnewpass[1] = '2';
chnewpass[2] = '3';
chnewpass[3] = '4';
chnewpass[4] = '5';
configuration.pass = (chnewpass);
why ?
thanks for your effort Mr. ard_newbie
new update
after changing my code to the below --
the password is changing to 1234 instead of 4321 after power off /reset
it means password is not stored in flash memory
#include <DueFlashStorage.h>
DueFlashStorage dueFlashStorage;
String newpass , flashpass;
char chnewpass[5];
struct Configuration {
char* pass;
};
Configuration configuration;
void setup() {
chnewpass[0]='1';
chnewpass[1]='2';
chnewpass[2]='3';
chnewpass[3]='4';
chnewpass[4]='\0';
Serial.begin(115200);
delay(500);
/* Flash is erased every time new code is uploaded. Write the default configuration to flash if first time */
// running for the first time?
uint8_t codeRunningForTheFirstTime = dueFlashStorage.read(10); // flash bytes will be 255 at first run
Serial.print("codeRunningForTheFirstTime: ");
if (codeRunningForTheFirstTime) {
Serial.println("yes");
chnewpass[0]='4';
chnewpass[1]='3';
chnewpass[2]='2';
chnewpass[3]='1';
chnewpass[4]='\0';
configuration.pass = (chnewpass);
delay(500);
//OK first time running, set defaults
for(int i = 0; i < 5; i++)
{delay(500);
Serial.print("chnewpass byte array: " );
Serial.print(i);
Serial.print( " = ");
Serial.println (chnewpass[i]);}
for(int i = 0; i < 5; i++)
{delay(500);
Serial.print("configuration.pass: " );
Serial.print(i);
Serial.print( " = ");
Serial.println (configuration.pass[i]);}
// write configuration struct to flash at adress 4
byte b2[sizeof(Configuration)]; // create byte array to store the struct
memcpy(b2, &configuration, sizeof(Configuration)); // copy the struct to the byte array
delay(500);
dueFlashStorage.write(4, b2, sizeof(Configuration)); // write byte array to flash
delay(500);
// write 0 to address 0 to indicate that it is not the first time running anymore
dueFlashStorage.write(10, 0);
}
else {
delay(500);
Serial.println("no");
}
}
void loop() {
byte* b = dueFlashStorage.readAddress(4); // byte array which is read from flash at adress 4
Configuration configurationFromFlash; // create a temporary struct
memcpy(&configurationFromFlash, b, sizeof(Configuration)); // copy byte array to temporary struct
Serial.print(" configurationFromFlash.pass:");
Serial.println(configurationFromFlash.pass);
Serial.print(" pass:");
flashpass = configurationFromFlash.pass;
Serial.println(flashpass);
//Serial.println(flashpass);
Serial.println();
delay(10000);}
